docs: def look_up(name):
      """Obtain an object from a qualified name. Example:
  
      >>> look_up('math.sin')
      <built-in function sin>
  
      This function should be considered the reverse of |object_name|.
  
      .. |look_up| replace:: :py:func:`look_up`"""
      path = name.split('.')
      module = import_module('.'.join(path[:-1]))
      return getattr(module, path[-1])